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Support casting negative scale decimals to numeric #9207

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Merged
alamb merged 6 commits into from
Jan 26, 2026
Merged

Support casting negative scale decimals to numeric #9207

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63b042c
feat: upport casting negative scale decimals to numeric
Chiicake Jan 17, 2026
8a14788
fix: pull the check out of hot loop
Chiicake Jan 17, 2026
7033f0c
fix: add more tests
Chiicake Jan 17, 2026
42b092c
fix: clippy check of too complex type
Chiicake Jan 18, 2026
03d045f
fix: remove the type alias
Chiicake Jan 20, 2026
bd9ce61
fix: cargo fmt
Chiicake Jan 20, 2026
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19 changes: 12 additions & 7 deletions arrow-cast/src/cast/decimal.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -816,7 +816,7 @@ where
{
let array = array.as_primitive::<D>();

let div: D::Native = base.pow_checked(scale as u32).map_err(|_| {
let div: D::Native = base.pow_checked(scale.unsigned_abs() as u32).map_err(|_| {
ArrowError::CastError(format!(
"Cannot cast to {:?}. The scale {} causes overflow.",
D::PREFIX,
Expand All @@ -831,11 +831,12 @@ where
if array.is_null(i) {
value_builder.append_null();
} else {
let v = array
.value(i)
.div_checked(div)
.ok()
.and_then(<T::Native as NumCast>::from::<D::Native>);
let v = if scale < 0 {
array.value(i).mul_checked(div).ok()
} else {
array.value(i).div_checked(div).ok()
}
.and_then(<T::Native as NumCast>::from::<D::Native>);

value_builder.append_option(v);
}
Expand All @@ -845,7 +846,11 @@ where
if array.is_null(i) {
value_builder.append_null();
} else {
let v = array.value(i).div_checked(div)?;
let v = if scale < 0 {
array.value(i).mul_checked(div)?
} else {
array.value(i).div_checked(div)?
};

let value = <T::Native as NumCast>::from::<D::Native>(v).ok_or_else(|| {
ArrowError::CastError(format!(
Expand Down
19 changes: 19 additions & 0 deletions arrow-cast/src/cast/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3886,6 +3886,25 @@ mod tests {
);
}

#[test]
fn test_cast_decimal_to_numeric_negative_scale() {
let value_array: Vec<Option<i256>> = vec![
Some(i256::from_i128(125)),
Some(i256::from_i128(225)),
Some(i256::from_i128(325)),
None,
Some(i256::from_i128(525)),
];
let array = create_decimal256_array(value_array, 38, -1).unwrap();

generate_cast_test_case!(
&array,
Int64Array,
&DataType::Int64,
vec![Some(1_250), Some(2_250), Some(3_250), None, Some(5_250)]
);
}

#[test]
fn test_cast_numeric_to_decimal128() {
let decimal_type = DataType::Decimal128(38, 6);
Expand Down
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